A Practical Guide to Ubuntu Linux, Third Edition

25. firestarter, gufw, and iptables: Setting Up a Firewall

IN THIS CHAPTER

Introduction to firestarter 864

firestarter: Setting Up and Maintaining a Firewall 866

ufw: The Uncomplicated Firewall 874

gufw: The Graphical Interface to ufw 876

Rules, matches, targets, and chains 880

Anatomy of an iptables Command 884

Building a Set of Rules Using iptables 885

Copying Rules to and from the Kernel 891

Sharing an Internet Connection Using NAT 892

The gufw and firestarter utilities are user-friendly, graphical front-ends for iptables; iptables builds and manipulates network packet filtering (page 1164) rules in the Linux kernel. You can use firestarter, or iptables directly, to create a firewall that protects a system from malicious users and to set ...